Sectional insulator.



3,0. GILLETTE. SECTION IN$ULATOR.

APPLICATION FILED AUG. 13, 1908,

Patented Mar. 5, 1912.

JOHN C. GILLETTE, OF BALTIMORE, MARYLAND, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

I snc'rxonar. InsuLA'roR.

- specification f Letters Patent.

Patented Mar. 5, 1912.

Application filed August 13, 1308. Serial No. 448,297.

1 1 '0 all whom it may concem:

Be it known that I, JOHN C. .Ganrnrrn, a citizen of the "United States, residing at Baltimore and State of-Maryland, have in vented certain new and useful Improvements in Section-Insulators, of which the following is a specification.

This invention relates to devices for-1nsulating the sections of overheadtrolley wires, and it is especially adapted for use in high speed roads employing a catenary suspension for its high potentlal overhead working conductor.

i The object of the invention is to provide simple but effective means for electrically separating but-mechanically connecting the adjacent ends of-the trolley wire and the messenger intwo, contiguous sections of the road, and to' properly support the entire. device upon the cross-arm or span wire of the roadway structure.

'lhe specific details of construction are hereinafter set forth, and the features of novelty are particularly pointed out in the claims. r

In the accompanying drawing, Figure 1 'is a top plan view of myumproved section insulator, and Fig. 2 is a side elevation, both figures beingpartly broken away and partly in section. h

A. runner bar 1 of insulating material.

such as wood, narrow in width but of silt ficient depth to be stiff and rigid,'supports at each end aporcelain insulator 2 of the spool type. The preferred means of support is a U-shaped yoke 3 which straddles the insulator and the end of the runner bar.

The ends of the yoke are screw-threaded, and ass through holes in L-shaped brackets 4 which are bolted to the sides ofthe runner bar. The yokes are secured in place by nuts 5, by means of which it is possible, also, to

adjust the insulators so that they will stand with their axes in the plane of the runner bar. That portion of the yokes which encircles the' insulators is preferably cushchipping. the insulator.

ioned; as by' means of a piece of rubber hose 6 to prevent vibration shocks from A stout circular metallic guard.7 surrounds the insulator at a little distance from the same, to prevent it from being struck by the trolley pole in case'the latter jumps ofi' the trolley wire or the runner bar.-

trolley shoe Bis supported below each insulator, said shoe being provided with suitable means for clamping the end of the trolley-wire 9. The shoes are in line with the lower edge of the runner bar, whose ends are preferably shod with sheet steel 10 toreduce the wear. Each shoe is secured to the lower end of -a bolt 11 which runs up through "the insulator, a washer 12 and a piece of fiber 13 being interposed between the insulator and the nut 14 which looks the bolt-i n place in the shoe. The bolt extends up a ove the insulator and is stiffened by a sleeve 15 which has a flange '16 at its lower end bearing upon the top of the insulator. This flange may be a nut screwed upon the end of the length of pipe which constitutes the sleeve. On top of the sleeve is aplate' washer 17, held in place by a nut 18 on the projecting upper end of the bolt. In each end of the washer is a hole, one for the attachment of the messenger wire or cable 19, and the other for the attachment of the anchorage for the same. Said anchorage consists preferably of two line strain insulators '20, one attached to each washer, and a length of wire cable 21 connecting said strain insulator. A. turn buckle 22 may be included in this connection for adjusting it to the proper length.

The cable 21 passes over the top of a bracket insulator 23 mounted on a cross-bar or. arm or span wire 24. The weight of the entire section insulator is carried by this bracket insulator.

ported trolley wires comprising a runner bar of insulating material, an insulator se-- cured to each end thereof, means carried by said insulators for supporting the ends of the trolley wire under tension, and an adjusting and supporting connection provided at its ends with insulated devices for engaging said trolley wire supporting means and for receiving the ends of the messenger.

2. A section insulator for messenger supsulator secured to each end thereof, an upright bolt in each insulator, a trolley wlre shoe attached to the lower end of each bolt, 'means for attaching the messenger cable to the upper end of each bolt, and an adjusting and supporting connection between the upper ends of said bolts, and said connection including one or more strain insulators.

3. A section insulator lcomprising a runner bar of insulating .material, a spool insulator ateach end of said bar, a. U-shaped 'yoke connecting said insulator and bar, an upright bolt in said insulator, and an insulating connection between the upper-ends of said bolts.

4. A section insulator comprising a runner bar of insulating material, a spool insulator at each end of said bar, a guard surrounding said insulator, and secured to said bar, an upright bolt in said insulator, and an insulating connection between the upper ends of said bolts.

5. A section insulator comprising a runner bar of insulating material, a spool insulatorat each end thereof, an upright bolt in said insulator extending below and above the same, a trolley shoe attached to the lower end of said bolt, a sleeve on the upper portion of said bolt, a plate washer clamped on top of said sleeve, and an insulating connection between the plate washers including a turn buckle.

6. A section insulator comprising a runnen-bar of insulating material, an insulator at each end thereof, an upright bolt in each of said insulators, a sleeve on the upper portion of each of said bolts, a plate washer clamped on top strain insulator attached to each washer, and a length of cable connectingsaid strain insulators.

7 A section insulator comprising a runner-bar of insulating material, an insulator at each end thereof, an upright bolt in each of said insulators, a sleeve'on the upper portion of each of said bolts, a plate washer clamped on top of each of said sleeves, a strain insulator attached to each washer, a length of cable connecting said strain-insulators, and means for tightening said cable.

In witness whereof, I have hereuntoset my hand this 5th dayof August, 1908.

' JOHN C. GILLETTE.

Witnesses:

WILLARD E. LOFGREN, SAMUEL M. SACHS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, I). C. i

of each of said sleeves, a 

